Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/http-kernel/DataCollector/RouterDataCollector.php

@@ -0,0 +1,102 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\DataCollector;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpFoundation\RedirectResponse;
+use Symfony\Component\HttpKernel\Event\FilterControllerEvent;
+
+/**
+ * RouterDataCollector.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class RouterDataCollector extends DataCollector
+{
+    protected $controllers;
+
+    public function __construct()
+    {
+        $this->controllers = new \SplObjectStorage();
+
+        $this->data = array(
+            'redirect' => false,
+            'url' => null,
+            'route' => null,
+        );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function collect(Request $request, Response $response, \Exception $exception = null)
+    {
+        if ($response instanceof RedirectResponse) {
+            $this->data['redirect'] = true;
+            $this->data['url'] = $response->getTargetUrl();
+
+            if ($this->controllers->contains($request)) {
+                $this->data['route'] = $this->guessRoute($request, $this->controllers[$request]);
+            }
+        }
+
+        unset($this->controllers[$request]);
+    }
+
+    protected function guessRoute(Request $request, $controller)
+    {
+        return 'n/a';
+    }
+
+    /**
+     * Remembers the controller associated to each request.
+     *
+     * @param FilterControllerEvent $event The filter controller event
+     */
+    public function onKernelController(FilterControllerEvent $event)
+    {
+        $this->controllers[$event->getRequest()] = $event->getController();
+    }
+
+    /**
+     * @return bool Whether this request will result in a redirect
+     */
+    public function getRedirect()
+    {
+        return $this->data['redirect'];
+    }
+
+    /**
+     * @return string|null The target URL
+     */
+    public function getTargetUrl()
+    {
+        return $this->data['url'];
+    }
+
+    /**
+     * @return string|null The target route
+     */
+    public function getTargetRoute()
+    {
+        return $this->data['route'];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'router';
+    }
+}